Double step drum is an integral drum with stepwise flanges and double step sections. It allows the multiple layer rope winding in non-operating portion of luffing mechanism to make drum shorter.
双阶梯卷筒是一种带有阶梯法兰盘和双阶梯截面的综合式卷筒，可在变幅机构的非工作区段使钢丝绳多层卷绕，以缩短卷筒长度；
They step and kick. They turn and spin. They step and kick again to the sounds of drum and horn.
他们踏眺踢腿， 扭身旋转， 顺着鼓和喇叭的乐声再次踏步踢腿。
Off to the drum sander for the next step: (the fadeout) You will want to really be careful on this step as it is a very important part of the bows strength and how the bow works.
到滚筒式砂光机为下一个步骤： （淡出）您将想要真正地小心在这步，因为它是弓力量的一个非常重要部分，并且怎么弓运作。
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